Lead69, Let me give you a real life example. Last year at NNN, I literally was in a slow van. When I had the competition coming around me by 30 mph in the 1/8 mile race, it was so hard to know if I should stay in it, back off a tad the last 20 ft, or anything else. There also was a head/cross wind and how did that effect the vans run?? You don't know till it's too late. It wasn't a cake walk by no means. But I had the van tuned and consistent. Only ran 400ths off from the worst pass to the best pass